Connected: An Internet Encyclopedia
RFC 1738 - 3.2.5. Optimization

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### 3.2.5. Optimization

Clients accessing resources via FTP may employ additional heuristics to optimize the interaction. For some FTP servers, for example, it may be reasonable to keep the control connection open while accessing multiple URLs from the same server. However, there is no common hierarchical model to the FTP protocol, so if a directory change command has been given, it is impossible in general to deduce what sequence should be given to navigate to another directory for a second retrieval, if the paths are different. The only reliable algorithm is to disconnect and reestablish the control connection.

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Connected: An Internet Encyclopedia
RFC 1738 - 3.2.5. Optimization